Paper box



May 18, 1937. Q CLAFF 2,080,532

PAPER BOX Filed Aug. 17, 1936 2 Sheets-Sheet l C. L. CLAFF PAPER BOX May 18, 1937.

Filed Aug. 1'7, 1936 2 Sheets-Sheet 2 ed @NNNNNNNNNAK VIII/r3716 4,

21 QL. Claff .wlllllll/l/lI/IQW Patented May 18 1937 UNITED STATES PATENT OFFICE PAPER BOX -Clarence L. Claif, Randolph, Mass. Application August 11, 1936, Serial No. 96,507

Claims.

This invention relates to paper boxes. While the improvements are designed primarily for use in connection with a box of the type shown, for example, in Patent 1,579,646, 5 issued on April 6, 1926, it is to be understood that they can be applied to any type of paper board box provided with a finish of covering paper and having lapping portions which normally present exposed raw edges.

For the purpose of eliminating raw edges various expedients have been adopted. For example, the covering paper has been extended beyond one or more of these raw edges of paper board and subsequently turned back over the edges to conceal them. This has required the use of special mechanism which has added materially to the cost of the equipment used in the production of boxes. Furthermore the one thickness of paper presented -by each extension, has frequently been broken readily so as to defeat the purpose for which it was intended. Another method of eliminating a raw edge as much as possible, has been to grind away a portion of the paper board so as to bring it to a feather edge. This likewise has required the use of extensive equipment and added to the cost of production.

The use of a single thickness of finishing paper for the purpose of sealing the raw edge of the paper board material has also been found objectionable because the raw edge of the finishing paper has been left exposed and where the color of the box contrasts strongly with the color of the body of the paper, this raw edge has been particularly prominent.

An object of the present invention is to overcome the objections herein enumerated by utilizing a fold of finishing paper for concealing the raw edge of the paper board, this folded ing a finishing flap of double thickness which does not leave exposed either the raw edge of the paper board nor the raw edge of the finishing paper, the flap thus provided being situated where it can be pressed back against the adjacent surface of the box while the box is being subjected to finishing pressure, the flap being held securely by an adhesive and presenting a smooth finished appearance unmarred by any raw edge.

A further object is to provide a box in which the present improvements can be applied either to the bottom edges of the ends of the box or to the side edges of the boxat the end, the I same smooth and well finished appearance being .presented no matter how thick may be the pamarginal portion of the finishing paper providper board material used in the construction of the box.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in certain novel details of construction and combinations of parts hereinafter more fully described and pointed out in the claims, it being understood that changes may be made within the scope of the appended claims without departing from the spirit of the invention.

In the accompanying drawings the preferred forms of the invention have been shown.

In said drawings:-

Figure 1 is a perspective view of a blank used in the formation of the end of a box such as disclosed in the patent hereinbefore referred to.

Figure 2 is a perspective view showing the blank after it has been folded prior to application to the other blank of the box to form the end thereof.

Figure 3 is a perspective view of one end portion of an inverted box to which the end blank has been applied and showing the finishing flap pressed back into position to conceal the raw edge at the bottom of the box.

Figure 4 is a central vertical section through the end of the box provided with the present improvements.

Figure 5 is a vertical section through the bottom portion of one end of a box, the same being enlarged to show the finishing flap scored along the inner side'thereof to produce a gradually curved outer finishing surface.

Figure 6 is a similar view showing the finishing flaps scored on the outer side to produce an abruptly curved finishing surface.

Figure '7 is a perspective view of an end blank used for concealing the raw side edges of the blank.

Figure 8 is a transverse section through the end of a box to which the blank, shown in Figure 7, has been applied, thereby concealing the raw side edges of the outer thickness of the end blank.

Figure 9 is an enlarged section through a portion of the end blank showing the finishing flap prior to being pressed back from normal position and with the score on oneside thereof.

Figure 10 is a similar view showing this score on the opposite side.

As has already been stated, the present improvements can be applied to any kind of a paper board box having a coating of finishing paper and in which lapping portions of the paper board are glued together. In the present instance, however, the improvements have been shown applied to a box of the type shown in the patent herein referred to. In said patented structure there is provided a main blank having a bottom portion I, sides 2, and inturned end wings} extending from the sides and bottom. An end blank 4 is folded transversely and placed astride and affixed to the wings 3 so as to form an end of double thickness. The bottom and sides I and 2 are provided with an outer covering of finishing paper indicated at. 5. Ordinarily the end blank 4 has been provided with an outer covering of finishing paper which has been cut of! either flush with the edges of the paper board or has been extended beyond one edge and subsequently folded back under and amxed to the bottom of the box. This has been done for the purpose of concealing the adjacent raw edge of the paper board. However it has required-the use of special machinery for turning back this flap of covering or finishing paper and affixing it to the bottom of the box. Furthermore the raw edge of the finishing paper has been left exposed and this has been particularly objectionable where the body portion of the finishing paper has been of a color contrasting strongly with the exposed surface of the finishing paper. Furthermore the single thickness of finishing paper has not had sufilcient strength along the covered raw edge of the paper board material to withstand rough handling and, consequently, the finishing paper has frequently. broken through along the raw edge and presented an unsightly appearance.

For the purpose of overcoming the several objections herein enumerated, the end blank 4 has been provided on one side with a covering of finishing paper indicated at 6 which is extended past the line of the fold of the blank, indicated at I and also beyond the bottom raw edge of the outer thickness of the folded blank so as to provide an extension 9 of finishing paper extending throughout the width of the blank 4. Instead of folding this extension back over the blank so as to fit tightly upon the raw edge 8, as has been the practice heretofore, it is the practice, in the present instance, to gum the extension 9 and fold it along a transverse intermediate line as indicated, for example, at It and that portion of the extension which laps the blank 4 is afiixed thereto. Thus the portion of the paper extending beyond the raw edge of the blank will form a fold of double thickness indicated-at II in Figure 2. During the formation of this fold it can be compressed or scored outwardly so as to extend under and close to the raw edge of the blank 4 as indicated at I! in Figures 2 and 9 or, if preferred, the outer side of the finishing paper can be pressed backwardly or scored along the outer side as indicated at I! in Figure 10. In either case, after the folded end blank 4 has been applied to the gummed inturned wings 3, it is subjected to compression by the usual means and this compressing action will result not only in binding the end blank tightly upon the wings 3, but will also force the projecting finishing fiap formed by the folded extension 9' back against the adjacent surface of finishing paper on the main blank. Thus not only will a raw edge of the finishing paper be eliminated, but the color of the flap will match the colorof the finishing paper on the main blank along a feather edge so that the line along which the two surfaces come together, will be barely discernible. If the folded extension 9 is pressed or scored outwardly as in Figures 2, 4, '5 and 9, the finishing surface will be rounded gradually as shown. However should the fold be pressedor scored backwardly or inwardly oppositely'to that disclosed in the figures referred to, and as shown in Figures 6 and 10, the curvature of the finishing paper adjacent to the bottom edge of the end blank will be more abrupt. In any case, however, the finished appearance will be pleasing to the eye because of the absence of all objectionable exposed edges.

While the present improvements are especially useful for eliminating raw edgesalong the bottoms of the end blanks. theycan also be used for concealing the raw side edges. When this result is sought, the finishing paper on the end blank II is made with side extensions l6 Obviously when this blank is applied under pressure to the main blank thefinishing flaps at the sides will be pressed back against and affixed to the adjacent portions of the main blank so as to produce well finished inconspicuous seams free from raw edges either of paper board material or of covering material.

It will be apparent that by following the method of construction herein described, it becomes unnecessary to use any special machinery for folding the finishing paper back under the bottom or back along the sides. All'that is required is to produce the one fold of the paper, making the fold along lines spaced from the paper board material so as to leave flaps of double thickness. The pressing operation which takes place during the completion of the box will be sufficient to press these folded flaps back against and to amx them to the adjacent surfaces of the main blank.

While these improvements have been described as applied toa box, it is to be understood that they can also be applied to box covers. Furtherscribed as applied to boxes made of separate blanks as shown in the patent referred to, they could also be applied to boxes made from single blanks with lapping portions presenting raw edges normally exposed.

What is claimed is:

1. A paper board box including a main blank andan-end portion. said main blank and end portion having an outer covering of finishing paper. the finishing paper of the end portion being folded back thereupon to present a folded extension or flap of finishing paper. said flap being pressed back against and aflixed to the main blank to conceal the adjacent raw edge of the end portion.

2. A paper board box including an end blank of paper board material, a thickness of covering paper on the outer surface of the blank, said covering paper extending beyond an edge of the blank and being folded back upon itself to present a flap of finishing paper which is of double thickness and conceals the raw edge of the blank.

3. A paper board box including an end blankcovering paper extending beyond an edge of the blank'and being folded back upon itself to present a flap of finishing paper which is of double thickness and conceals the raw edge of the blank,

aosaasa said flap being oflset transversely across and close to the edge of the blank.

4. A paper board box including an end blank of paper board material, a thickness of covering paper on the outer surface of the blank, said covering paper extending beyond an edge of the blank and being folded back upon itself to present a flap of finishing paper which is of double thickness and conceals the raw edge of the blank, said flap being ofl'set transversely across and close to the edge of the blank, the opposed portions of the flap being afiixed to each other. 1

5. The combination with the bottom and sides of a box formed of paper board having an outer covering of finishing paper, of an end formed of paper board and joined to the sides and bottom, an outer covering of finishing paper on said end, said finishing paper being extended beyond the paper board material of the end and folded upon itself to form a finishing flap of double thickness, said flap being pressed back against and aflixed to the adjacent portion of the box to conceal the raw edge of the end portion of the box without exposing a corresponding raw edge of the finishing paper.

CLARENCE L. CLAFF. 

